package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.Setmeal;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.exception.DishDisableFailedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetMealDishMapper;
import com.sky.mapper.SetMealMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Objects;

@Service
@Slf4j
public class DishServiceImpl implements DishService {
    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private DishFlavorMapper dishFlavorMapper;

    @Autowired
    private SetMealMapper setMealMapper;

    @Autowired
    private SetMealDishMapper setMealDishMapper;

    /**
     * 新增菜品和对应的口味数据
     *
     * @param dishDTO 新增菜品时传递的数据模型
     */
    @Transactional
    @Override
    public void saveWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        // 向菜品表插入1条数据
        dishMapper.insert(dish);
        // 获取insert生成的主键值
        Long dishId = dish.getId();

        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (!flavors.isEmpty()) {
            flavors.forEach(dishFlavor -> dishFlavor.setDishId(dishId));
            // 向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /**
     * 菜品分页查询
     *
     * @param dishPageQueryDTO 分页查询菜品时传递的数据模型
     * @return 分页查询结果
     */
    @Override
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);
        return new PageResult(page.getTotal(), page.getResult());
    }

    /**
     * 批量删除菜品
     *
     * @param ids id集合
     */
    @Transactional
    @Override
    public void deleteBatch(List<Long> ids) {
        // 判断当前菜品是否能被删除
        // 1.是否起售中
/*
        for (Long id : ids) {
            Dish dish = dishMapper.getById(id);
            if (Objects.equals(dish.getStatus(), StatusConstant.ENABLE)) {
                // 有菜品起售中，不能被删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }
*/
        List<Dish> dishes = dishMapper.getByIds(ids);
        for (Dish dish : dishes) {
            if (Objects.equals(dish.getStatus(), StatusConstant.ENABLE)) {
                // 有菜品起售中，不能被删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }
        // 2.是否被套餐关联
        List<Long> setMealIds = setMealDishMapper.getSetMealIdsByDishIds(ids);
        if (!setMealIds.isEmpty()) {
            // 当前菜品被套餐关联，不能被删除
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }
        // 删除菜品关联的口味数据
        dishFlavorMapper.deleteByDishIds(ids);
        // 删除菜品表中的菜品数据
        dishMapper.deleteByIds(ids);
    }

    /**
     * 根据id查询菜品和对应的口味数据
     *
     * @param id id
     * @return 查询结果
     */
    @Override
    public DishVO getByIdWithFlavor(Long id) {
        DishVO dishVO = new DishVO();
        // 根据id查询菜品数据
        Dish dish = dishMapper.getById(id);
        BeanUtils.copyProperties(dish, dishVO);
        // 根据菜品id查询口味数据
        List<DishFlavor> dishFlavors = dishFlavorMapper.getByDishId(id);
        dishVO.setFlavors(dishFlavors);
        return dishVO;
    }

    /**
     * 修改菜品及其对应的口味信息
     *
     * @param dishDTO 修改菜品时传递的数据模型
     */
    @Override
    public void updateWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        // 修改菜品表的基本信息
        dishMapper.update(dish);
        // 删除原有的口味数据
        dishFlavorMapper.deleteByDishIds(Collections.singletonList(dish.getId()));
        // 插入口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (!flavors.isEmpty()) {
            flavors.forEach(dishFlavor -> dishFlavor.setDishId(dish.getId()));
            // 向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /**
     * 菜品起售停售
     *
     * @param status 状态
     * @param id     id
     */
    @Override
    public void startOrStop(Integer status, Long id) {
        // 如果为菜品起售转停售，则需要判断菜品是否关联了已起售的套餐
        if (Objects.equals(status, StatusConstant.DISABLE)) {
            List<Long> setMealIds = setMealDishMapper.getSetMealIdsByDishIds(Collections.singletonList(id));
            if (!setMealIds.isEmpty()) {
                List<Setmeal> list = setMealMapper.getByIds(setMealIds);
                for (Setmeal setmeal : list) {
                    if (Objects.equals(setmeal.getStatus(), StatusConstant.ENABLE)) {
                        // 菜品关联了已起售的套餐，无法停售菜品
                        throw new DishDisableFailedException(MessageConstant.DISH_DISABLE_FAILED);
                    }
                }
            }
        }
        Dish dish = Dish.builder()
                .status(status)
                .id(id)
                .build();
        dishMapper.update(dish);
    }

    /**
     * 根据分类id查询菜品
     *
     * @param categoryId 分类id
     * @return 查询结果
     */
    @Override
    public List<Dish> list(Long categoryId) {
        Dish dish = Dish.builder()
                .categoryId(categoryId)
                .status(StatusConstant.ENABLE)
                .build();
        return dishMapper.list(dish);
    }

    /**
     * 条件查询菜品和口味
     *
     * @param dish 菜品
     * @return 菜品口味模型
     */
    @Override
    public List<DishVO> listWithFlavor(Dish dish) {
        // 根据菜品的分类id查询所有该分类下的菜品
        List<Dish> dishList = dishMapper.list(dish);
        List<DishVO> dishVOList = new ArrayList<>();
        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d, dishVO);
            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }
        return dishVOList;
    }
}
